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(No ModeL) F. VAN RYSSELBERGHE. MEANS FOR PREVENTING FALSE SIGNALS ONREVERSALS IN QUADRUPLEX TELEGRAPHS.

No. 326,892. Patented Sept. 22, 1885.

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MEANS FOR PREVENTING FALSE SIGNALS ON REVERSALS IN QUADRUPLEXTELEGRAPHS.

SPECIFICATION forming part of Letters Patent No. 326,892, datedSeptember 22, 1885.

Application filed May 18, 1885.

T0 at whom it may concern:

Be it known that I, FRANooIs VAN RYssEL- BERGHE, a subject of the Kingof Belgium, residing at Schaerbeek, Belgium, have invented new anduseful Improvements in Means for Preventing False Signals on Reversalsin Quadruplex Telegraphs, of which the following is a specification.

My invention relates to a system of telegraphy in which two independentsignals or sets of signals may be simultaneously transmitted in the samedirect-ion over a single electric conductor.

The invention consists in improved means for avoiding the false signalswhich are produced upon the ordinary receivi rig-instrument of aquadruplex telegraph by changes in the static condition of the line whenthe ptlarity of the current is reversed during the transmission of thesignal.

In the accompanying drawing are illustrated my arrangements of circuitsand instruments for preventing false signals or reversals in aquadruplex telegraph.

The drawing shows the instruments located at one station of an ordinaryquadruplex telegraph. They consist of the main battery 1, the Stearnstransmitter 2, the signals of which are interpreted by the neutral relay3, and the pole-changing and circuit-preserving transmitter 4, thesignals of which are interpreted by the polarized relay 5, having thearmature 5, acting against the front and rear stops, 5" 5. The aboveparts, being of the ordinary construction, need no further explanation.

It is well known that when in the sendingstation of a quadruplextelegraph the polechanger is operated there will be an instant at eachreversal when there is no current upon the main line; and since thisoccurs while the armature 6 ofthe neutral relay 3 is being attracted atthe receivingstation the spring draw for an instant the armature-lever 8toward the stop 9 and cause the production of afalse signal. In order toprevent this, 1 com bine with the ordinary neutral relay 3 an additional electro-magnet, 10, which acts upon an additional armature, 11,fixed on the lever 8, bearing the armature 6 of the neutral relay. NVithsaid additional magnet 10, I combine any electrical contrivanee ordevices capable (No model.)

of sending through the circuit of said magnet an instantaneous currentat the very moment of the reversal of the current in the main line, ifatthe same time the lever of the neutral relay is in contact with the stop12.

Various means may be resorted to for send ing a current through theadditional magnet, and in the drawing I have shown for such purpose acondenser, 13, an additional relay, 14, and alocal battery, 15. Thecircuit of the latter is closed, first through the additionalelectromagnet 10, and next through the armaturelever 16 of theadditional relay 14, said lever making a short circuit when it remainsin contact with the stop 17, and preventing in this manner the action ofthe local battery 15 upon the electroniagnet 10. Upon each reversal ofthe current in the main line 18, the charge of the condenser 13 beingreversed, an instantaneous current goes through the electro-n1agnet ofthe additional relay 14, and the armature of the latter being thenattracted for an instant, the lever 16 of said armature is for aninstant not in contact with the stop 19, and the short circuit beingthus broken the battery 15 acts for an instant upon the additionalelectro-magnet 10 just at the very time when the ordinary electro-magnetof the neutral relay 3 becomes momentarily inoperative by reason of thereversal of the current in the main line.

It is readily apparent that the additional electromagnet 10 replaces theordinary electro-magnet of the neutral relay at the time when the latterbecomes momentarily inactive, and for this reason the production offalse signals on reversals is effectively prevented. The advantages ofmy system are due to the following facts, viz: It is well known that,notwithstanding the very high velocity or speed of electricity, theaction of a current occurs not exactly at the same time or moment in allthe parts of the circuit. For instance, when the transmitting-key placesthe circuit in connection with the battery, the beginning of the circuitis influenced before the end of said circuit, and while the dilferenceof time may be exceedingly short such a difference really exists. Thuswhen the transmitting-station reverses the current this influence willfirst be perceived at the point 21, then in the polarized relay 5, and,finally, in the electro-magnet of the neutral relay, and at that verymoment the armature-lever 6 will have a tendency to escape. It is justat this moment that the additional electro-magnet 10 must come intoaction. Were it to operate an instant before or after it would itself bethe source of a false or altered signal.

Experience has shown that the combination and arrangement of parts seenin the drawing serve most perfectly to prevent false signals, this beingdue to the presence of the additional magnet 10, which acts only at thevery moment when its services are required, and at no other time.

As above stated, the reversal of the current is first perceived at thepoint 21, and before reaching the electro-magnet of the neutral relay ithas to go through the polarized relay 5, these being the conditions withthe current starting in one way from the point 21. In the other way itis evident that before the effects of the current can be perceived inthe additional magnet 10 it must act upon the condenser 13, then uponthe additional electro-magnet 14; and since it takes exactly as long forthe reversed current to travel in the two directions the local currentfrom the battery 15 will have time to act upon the additionalelectro-magnet and prevent the production of a false signal.

The ends of the circuit of the condenser 13 and the electro-magnetoftherelay 14 are shown in the drawing as being connected, respectively,with the ground at the point and with the main line at 21; but they mayalso be connected with the main line at the point 22 and with theartificial circuit at the point 23.

My invention is not necessarily confined to quadruplex telegraphy, sinceit may be used in connection with multiplex telegraphy by making theproper adaptation of parts.

Havingthus described myinvention, What I claim, and desire to secure byLetters Patent, 1s

1. In a multiplex telegraph for preventing false signals on reversals,the combination, with the main line and ordinary neutral relay locatedtherein, of an additional electromagnet, an armature-lever common toboth the additional electro-magnet and ordinary neutral relay, a localbattery, and an additional relayconnected with themain line, and adaptedto control the circuit-connections of the local battery and additionalelectro-magnet, substantially as herein set forth.

2. In a multiplex telegraph for preventing false signals on reversals,the combination, with the main line, of an additional relay, a condenserseparating said main line and additional relay, 2. local battery, theordinary neutral relay, and additional electro-magnet, the latter beingincluded in the circuit of the local battery,the additional relayserving to control the circuit connections of said local battery and theadditional electro-magnet, substantially as shown and described.

In testimony whereofI affix my signature in presence of two Witnesses.

FRANQOIS VAN RYSSELBERGHE.

\Vitnesses:

T. BERTIN, EDWD. H. CLOUD.

